As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) PILOTS SEAT HYDRAULIC ADJUSTMENT UNITS FAULTY - SEAT HAS BEEN LOCKED IN A SINGLE POSITION BY FITTING TUBE SPACERS OVER THE PISTON RODS - WITH THE SEAT LOCKED IN A HIGH POSITION THE PILOTS HEAD IS IN CLOSE PROXIMITY TO THE CABIN ROOF - UNAPPROVEDMODIFICATION - PERSONNEL/MAINTENANCE ERROR